www.fairchildsemi.com
KM4100/KM4101
Low Cost, +2.7V and +5V, 260MHz Rail-to-Rail Amplifiers
Features
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General Description
The KM4100 (single) and KM4101 (single with
disable) are low cost, voltage feedback amplifiers.
These amplifiers are designed to operate on +2.7V,
+5V, or ±2.5V supplies. The input voltage range
extends 300mV below the negative rail and 1.2V
below the positive rail.
260MHz bandwidth
Fully specified at +2.7V and +5V supplies
Output voltage range:
0.036V to 4.953V; Vs = +5; RL = 2kΩ
Input voltage range: -0.3V to +3.8V; Vs = +5
150V/µs slew rate
4.2mA supply current
Power down to Is = 127µA (KM4101)
±60mA linear output current
±90mA output short circuit current
Directly replaces AD8051 and LM7131 in single
supply applications
Small package options (SOT-23, SOIC)
The KM4100 offers superior dynamic performance
with a 260MHz small signal bandwidth and 150V/µs
slew rate. The combination of low power, high
output current drive, and rail-to-rail performance
make the KM4100 well suited for battery-powered
communication/computing systems.
The combination of low cost and high performance
make the KM4100 suitable for high volume applications
in both consumer and industrial applications such as
wireless phones, scanners, and color copiers.
Applications
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A/D driver
Active filters
CCD imaging systems
CD/DVD ROM
Coaxial cable drivers
High capacitive load driver
Portable/battery-powered applications
Twisted pair driver
Video driver
Output Swing
2.7
Output Voltage (0.5V/div)
■
KM4100/KM4101 Packages
SOT23-6 (KM4101)
SOT23-5 (KM4100)
-Vs
2
+In
3
5
+Vs
-
4
-In
Out
1
-Vs
2
+In
3
1
-In
2
+In
3
-Vs
4
+
-
6
+Vs
5
DIS
4
-In
0
Time (0.5µs/div)
SOIC (KM4101)
SOIC (KM4100)
NC
+
1
+
Out
Vs = +2.7V
RL = 2kΩ
G = -1
8
NC
NC
1
7
+Vs
-In
2
6
Out
+In
3
5
NC
-Vs
4
+
8
DIS
7
+Vs
6
Out
5
NC
REV. 1A February 2001
DATA SHEET
KM4100/KM4101
KM4100/KM4101 Electrical Characteristics
Parameters
(Vs = +2.7V, G = 2, RL = 2kΩ to Vs/2; unless noted)
Conditions
Case Temperature
Frequency Domain Response
-3dB bandwidth
TYP
Min & Max
+25°C
+25°C
UNITS
NOTES
1
G = +1, Vo = 0.05Vpp
G = +2, Vo = 0.2Vpp
G = +2, Vo = 2Vpp
215
85
36
86
MHz
MHz
MHz
MHz
Time Domain Response
rise and fall time
settling time to 0.1%
overshoot
slew rate
0.2V step
1V step
0.2V step,
2.7V step, G = -1
3.7
40
9
140
ns
ns
%
V/µs
Distortion and Noise Response
2nd harmonic distortion
3rd harmonic distortion
THD
input voltage noise
input current noise
1Vpp, 5MHz
1Vpp, 5MHz
1Vpp, 5MHz
>1MHz
>1MHz
86
85
76
16
1.3
dBc
dBc
dB
nV/√Hz
pA/√Hz
1
1
1
2
±1
52
65
5
100
mV
µV/°C
µA
nA/°C
µA
dB
dB
mA
µA
2
2
2
2
2
72
MΩ
pF
V
dB
2
full power bandwidth
gain bandwidth product
DC Performance
input offset voltage
average drift
input bias current
average drift
input offset current
power supply rejection ratio
open loop gain
quiescent current
quiescent current (disabled)
Input Characteristics
input resistance
input capacitance
input common mode voltage range
common mode rejection ratio
Disable Characteristics (KM4101)
turn on time
turn off time
off isolation
Output Characteristics
output voltage swing
linear output current
1
-1.6
10
3
7
0
57
75
3.9
58
DC
4.3
1.5
-0.3 to 1.5
87
DC, Vcm = 0V to Vs - 1.5
±8
±8
150
25
75
5MHz, RL = 100Ω
RL = 10kΩ to Vs/2
RL = 2kΩ to Vs/2
RL = 150Ω to Vs/2
ns
ns
dB
0.023 to 2.66
0.025 to 2.653 0.1 to 2.6
0.065 to 2.55 0.3 to 2.325
±60
±55
±90
2.7
2.5 to 5.5
-40°C to +85°C
short circuit output current
power supply operating range
2
V
V
V
mA
mA
mA
V
2
2
Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels
are determined from tested parameters.
NOTES:
1) Rf = 1kΩ was used used for optimal performance. (For G = +1, Rf = 0)
2) 100% tested at +25°C.
Absolute Maximum Ratings
supply voltage
0 to +6V
maximum junction temperature
+175°C
storage temperature range
-65°C to +150°C
lead temperature (10 sec)
+300°C
operating temperature range (recommended) -40°C to +85°C
input voltage range
+Vs +0.5V; -Vs -0.5V
internal power dissipation
see power derating curves
2
Package Thermal Resistance
Package
θJA
5 lead SOT23
6 lead SOT23
8 lead SOIC
256°C/W
230°C/W
152°C/W
REV. 1A February 2001
KM4100/KM4101
DATA SHEET
KM4100/KM4101 Electrical Characteristics
Parameters
(Vs = +5V, G = 2, RL = 2kΩ to Vs/2; unless noted)
Conditions
Case Temperature
Frequency Domain Response
-3dB bandwidth
TYP
Min & Max
+25°C
+25°C
UNITS
NOTES
1
G = +1, Vo = 0.05Vpp
G = +2, Vo = 0.2Vpp
G = +2, Vo = 2Vpp
260
90
40
90
MHz
MHz
MHz
MHz
Time Domain Response
rise and fall time
settling time to 0.1%
overshoot
slew rate
0.2V step
2V step
0.2V step,
5V step, G = -1
3.6
40
7
150
ns
ns
%
V/µs
Distortion and Noise Response
2nd harmonic distortion
3rd harmonic distortion
THD
input voltage noise
input current noise
2Vpp, 5MHz
2Vpp, 5MHz
2Vpp, 5MHz
>1MHz
>1MHz
70
78
68
16
1.3
dBc
dBc
dB
nV/√Hz
pA/√Hz
1
1
1
2
±0.8
52
68
5.2
170
mV
µV/°C
µA
nA/°C
µA
dB
dB
mA
µA
2
2
2
2
2
72
MΩ
pF
V
dB
2
full power bandwidth
gain bandwidth product
DC Performance
input offset voltage
average drift
input bias current
average drift
input offset current
power supply rejection ratio
open loop gain
quiescent current
quiescent current (disabled)
Input Characteristics
input resistance
input capacitance
input common mode voltage range
common mode rejection ratio
Disable Characteristics (KM4101)
turn on time
turn off time
off isolation
Output Characteristics
output voltage swing
linear output current
1
DC
DC, Vcm = 0V to Vs - 1.5
5MHz, RL = 100Ω
RL = 10kΩ to Vs/2
RL = 2kΩ to Vs/2
RL = 150Ω to Vs/2
-40°C to +85°C
short circuit output current
power supply operating range
1.4
10
3
7
0
57
78
4.2
127
4.3
1.5
-0.3 to 3.8
87
±8
±8
150
25
75
0.027 to 4.97
0.036 to 4.953 0.1 to 4.9
0.12 to 4.8
0.3 to 4.625
±60
±55
±90
5
2.5 to 5.5
2
ns
ns
dB
V
V
V
mA
mA
mA
V
2
2
Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels
are determined from tested parameters.
NOTES:
1) Rf = 1kΩ was used used for optimal performance. (For G = +1, Rf = 0)
2) 100% tested at +25°C.
REV. 1A February 2001
3
DATA SHEET
KM4100/KM4101
KM4100/KM4101 Performance Characteristics (Vs = +5V, G = 2, Rf = 2kΩ, RL = 2kΩ to Vs/2; unless noted)
G=2
Rf = 1kΩ
Inverting Freq. Response Vs = +5V
Normalized Magnitude (1dB/div)
Normalized Magnitude (1dB/div)
Non-Inverting Freq. Response Vs = +5V
G=1
Rf = 0
G = 10
Rf = 2kΩ
G=5
Rf = 2kΩ
0.1
1
10
G = -10
Rf = 2kΩ
G = -5
Rf = 2kΩ
0.1
100
1
Frequency (MHz)
Normalized Magnitude (1dB/div)
Normalized Magnitude (1dB/div)
G=2
Rf = 1kΩ
G = 10
Rf = 2kΩ
G=5
Rf = 2kΩ
10
G = -10
Rf = 2kΩ
G = -5
Rf = 2kΩ
0.1
100
1
Magnitude (1dB/div)
Magnitude (1dB/div)
CL = 50pF
Rs = 33Ω
CL = 20pF
Rs = 20Ω
Rs
CL
RL
1kΩ
0.1
1
100
Large Signal Frequency Response
CL = 100pF
Rs = 25Ω
1kΩ
10
Frequency (MHz)
Frequency Response vs. CL
+
G = -1
Rf = 2kΩ
G = -2
Rf = 2kΩ
Frequency (MHz)
-
100
Inverting Freq. Response Vs = +2.7
G=1
Rf = 0
1
10
Frequency (MHz)
Non-Inverting Freq. Response Vs = +2.7
0.1
G = -1
Rf = 2kΩ
G = -2
Rf = 2kΩ
Vo = 1Vpp
Vo = 2Vpp
CL = 10pF
Rs = 0Ω
10
0.1
100
1
10
100
Frequency (MHz)
Frequency (MHz)
Frequency Response vs. Temperature
Input Voltage Noise
100
Magnitude (0.5dB/div)
Voltage Noise (nV/√Hz)
90
80
70
60
50
40
30
20
10
0
1
10
Frequency (MHz)
4
100
1k
10k
100k
1M
Frequency (Hz)
REV. 1A February 2001
KM4100/KM4101
DATA SHEET
KM4100/KM4101 Performance Characteristics (Vs = +5V, G = 2, Rf = 2kΩ, RL = 2kΩ to Vs/2; unless noted)
2nd & 3rd Harmonic Distortion; Vs = +2.7V
2nd & 3rd Harmonic Distortion; Vs = +5V
-20
-20
Vo = 2Vpp
Rf = 1kΩ
-40
3rd
RL = 150Ω
2nd
RL = 150Ω
-50
-60
2nd
RL = 2kΩ
-70
3rd
RL = 2kΩ
-80
Vo = 1Vpp
Rf = 1kΩ
-30
Distortion (dB)
Distortion (dB)
-30
2nd
RL = 150Ω
3rd
RL = 150Ω
-40
-50
-60
2nd
RL = 2kΩ
-70
3rd
RL = 2kΩ
-80
-90
-90
0
5
10
15
0
20
5
2nd Harmonic Distortion vs. Vo
15
20
3rd Harmonic Distortion vs. Vo
-20
-20
Rf = 1kΩ
Rf = 1kΩ
-30
-30
-40
Distortion (dB)
Distortion (dB)
10
Frequency (MHz)
Frequency (MHz)
20MHz
-50
-60
10MHz
-70
-80
-40
-50
20MHz
-60
-70
10MHz
-80
5MHz
-90
5MHz
-90
0.5
1.0
1.5
2.0
0.5
2.5
Output Amplitude (Vpp)
1.0
1.5
2.0
2.5
Output Amplitude (Vpp)
PSRR
CMRR
-40
0
-10
-50
CMRR (dB)
PSRR (dB)
-20
-30
-40
-60
-70
-50
-80
-60
-70
-90
1k
0.01
0.1
1
0.01
100
10
0.1
Frequency (MHz)
0.6
60
|Gain|
40
30
0
20
Phase
-45
-90
0
-10
-20
0.01
0.1
1
10
Frequency (MHz)
REV. 1A February 2001
100
Output Voltage (V)
70
10
10
100
Output Current
0.8
Phase (degrees)
Open Loop Gain (dB)
Open Loop Gain & Phase vs. Frequency
80
50
1.0
Frequency (MHz)
0.4
0.2
Linear output current +60mA
0
-0.2
Short circuit current +90mA
-0.4
-135
-0.6
-180
-0.8
-100
-50
0
50
100
Output Current (mA)
5
DATA SHEET
KM4100/KM4101
KM4100/KM4101 Performance Characteristics (Vs = +5V, G = 2, Rf = 2kΩ, RL = 2kΩ to Vs/2; unless noted)
Small Signal Pulse Response Vs = +2.7V
Rf = 1kΩ
Rf = 1kΩ
Output Voltage (0.05V/div)
Output Voltage (0.05V/div)
Small Signal Pulse Response Vs = +5V
Time (20ns/div)
Time (20ns/div)
Large Signal Pulse Response Vs = +5V
Output Swing
Rf = 1kΩ
Output Voltage (0.5V/div)
Output Voltage (0.5V/div)
2.7
Vs = +2.7V
RL = 2kΩ
G = -1
0
Time (20ns/div)
Time (0.5µs/div)
Vin = 0.2Vpp sinusoid
with 0.1V offset
5V
Disable
Pulse
0V
Output
Time (2µs/div)
CMIR
Output Voltage (4mV/div)
Output Voltage (0.05V/div)
Enable/Disable Response
0
-1
0
1
2
3
4
5
CMIR (1V/div)
6
REV. 1A February 2001
KM4100/KM4101
DATA SHEET
The common mode input range extends to 300mV
below ground and to 1.2V below Vs. Exceeding these
values will not cause phase reversal. However, if the
input voltage exceeds the rails by more than 0.5V, the
input ESD devices will begin to conduct. The output
will stay at the rail during this overdrive condition.
The design uses a Darlington output stage. The output
stage is short circuit protected and offers “soft”
saturation protection that improves recovery time.
The typical circuit schematic is shown in Figure 1.
+Vs
6.8µF
Frequency Reponse vs. Rf
G=2
RL = 2kΩ
Vs = +5V
Magnitude (1dB/div)
General Description
The KM4100/KM4101 are single supply, general
purpose, voltage-feedback amplifiers fabricated on a
complementary bipolar process using a patent pending
topology. They feature a rail-to-rail output stage and
are unity gain stable. Both gain bandwidth and slew
rate are insensitive to temperature.
Rf = 2kΩ
Rf = 1kΩ
1
10
100
Frequency (MHz)
Figure 2: Frequency Response vs. Rf
Power Dissipation
The maximum internal power dissipation allowed is
directly related to the maximum junction temperature.
If the maximum junction temperature exceeds 150°C,
some reliability degradation will occur. If the maximum
junction temperature exceeds 175°C for an extended
time, device failure may occur.
+
+
0.01µF
Out
KM4100
Rg
Figure 1: Typical Configuration
At non-inverting gains other than G = +1, keep Rg
below 1kΩ to minimize peaking; thus, for optimum
response at a gain of +2, a feedback resistor of 1kΩ is
recommended. Figure 2 illustrates the KM4100/
KM4101 frequency response with both 1kΩ and 2kΩ
feedback resistors.
Enable/Disable Function (KM4101)
The KM4101 offers an active-low disable pin that can
be used to lower its supply current. Leave the pin
floating to enable the part. Pull the disable pin to the
negative supply (which is ground in a single supply
application) to disable the output. During the disable
condition, the nominal supply current will drop to
below 127µA and the output will be at high impedance
with about 2pF capacitance.
REV. 1A February 2001
Maximum Power Dissipation
Rf
Maximum Power Dissipation (W)
In
The KM4100/KM4101 are short circuit protected.
However, this may not guarantee that the maximum
junction temperature (+150°C) is not exceeded under
all conditions. Follow the maximum power derating
curves shown in Figure 3 to ensure proper operation.
2.0
1.5
SOIC-8 lead
1.0
0.5
SOT23-6 lead
SOT23-5 lead
0
-50
-30
-10
10
30
50
70
90
Ambient Temperature ( C)
Figure 3: Power Derating Curves
Overdrive Recovery
For an amplifier, an overdrive condition occurs when
the output and/or input ranges are exceeded. The
recovery time varies based on whether the input or
output is overdriven and by how much the ranges are
exceeded. The KM4100/KM4101 will typically recover
in less than 20ns from an overdrive condition. Figure
4 shows the KM4100 in an overdriven condition.
7
DATA SHEET
KM4100/KM4101
Refer to the evaluation board layouts shown in Figure
7 for more information.
Overdrive Recovery
RL = 2kΩ
Vin =2Vpp
G=5
Rf = 1kΩ
Input Voltage (0.5V/div)
Input
Evaluation Board Information
The following evaluation boards are available to aid
in the testing and layout of this device:
Output
Eval Board
Time (20ns/div)
Figure 4: Overdrive Recovery
Driving Capacitive Loads
The Frequency Response vs. CL plot on page 4,
illustrates the response of the KM4100 and KM4101. A
small series resistance (Rs) at the output of the amplifier,
illustrated in Figure 5, will improve stability and
settling performance. Rs values in the Frequency
Response vs. CL plot were chosen to achieve maximum
bandwidth with less than 1dB of peaking. For maximum
flatness, use a larger Rs.
+
Description
Products
KEB002
Single Channel,
KM4100IT5,
Dual Supply 5 & 6 lead SOT23 KM4101IT6
KEB003
Single Channel, Dual Supply
8 lead SOIC
KM4100IC8,
KM4101IC8
Evaluation board schematics and layouts are shown in
Figure 6 and Figure 7.
The KEB002 and KEB003 evaluation boards are built
for dual supply operation. Follow these steps to use
the board in a single supply application:
1. Short -Vs to ground
2. Use C3 and C4, if the -Vs pin of the KM4100 or
KM4101 is not directly connected to the
ground plane.
Rs
Rf
CL
RL
Rg
Figure 5: Typical Topology for driving
a capacitive load
Layout Considerations
General layout and supply bypassing play major roles
in high frequency performance. Fairchild has evaluation
boards to use as a guide for high frequency layout
and to aid in device testing and characterization.
Follow the steps below as a basis for high frequency
layout:
Include 6.8µF and 0.01µF ceramic capacitors
Place the 6.8µF capacitor within 0.75 inches
of the power pin
■ Place the 0.01µF capacitor within 0.1 inches
of the power pin
■ Remove the ground plane under and around the
part, especially near the input and output pins to
reduce parasitic capacitance
■ Minimize all trace lengths to reduce
series inductances
■
■
8
Figure 6: Evaluation Board Schematic
(SOIC pinout shown)
REV. 1A February 2001
KM4100/KM4101
DATA SHEET
KM4100/KM4101 Evaluation Board Layout
Figure 7a: KEB002 (top side)
Figure 7b: KEB002 (bottom side)
Figure 7c: KEB003 (top side)
Figure 7d: KEB003 (bottom side)
REV. 1A February 2001
9
DATA SHEET
KM4100/KM4101
SOT23-5
CL
b
DATUM ’A’
KM4100/KM4101 Package Dimensions
e
2
CL
CL
E
E1
α
e1
C
D
CL
A
MAX
1.45
0.15
1.30
0.50
0.20
3.10
3.00
1.75
0.55
0.95 ref
1.90 ref
0
10
1. All dimensions are in millimeters.
2 Foot length measured reference to flat
foot surface parallel to DATUM ’A’ and lead surface.
3. Package outline exclusive of mold flash & metal burr.
4. Package outline inclusive of solder plating.
5. Comply to EIAJ SC74A.
6. Package ST 0003 REV A supercedes SOT-D-2005 REV C.
CL
DATUM ’A’
A1
b
MIN
0.90
0.00
0.90
0.25
0.09
2.80
2.60
1.50
0.35
NOTE:
A2
SOT23-6
SYMBOL
A
A1
A2
b
C
D
E
E1
L
e
e1
α
e
2
CL
CL
E
E1
α
e1
C
D
CL
A
SYMBOL
A
A1
A2
b
C
D
E
E1
L
e
e1
α
MAX
1.45
0.15
1.30
0.50
0.20
3.10
3.00
1.75
0.55
0.95 ref
1.90 ref
0
10
NOTE:
A2
1. All dimensions are in millimeters.
2 Foot length measured reference to flat
foot surface parallel to DATUM ’A’ and lead surface.
3. Package outline exclusive of mold flash & metal burr.
4. Package outline inclusive of solder plating.
5. Comply to EIAJ SC74A.
6. Package ST 0004 REV A supercedes SOT-D-2006 REV C.
A1
SOIC-8
SOIC
D
e
SYMBOL
A1
B
C
D
E
e
H
h
L
A
7¡
ZD
CL
CL
Pin No. 1
E
H
B
A
A1
ZD
A2
DETAIL-A
h x 45¡
A2
MIN
MAX
0.10
0.25
0.36
0.46
0.19
0.25
4.80
4.98
3.81
3.99
1.27 BSC
5.80
6.20
0.25
0.50
0.41
1.27
1.52
1.72
8
0
0.53 ref
1.37
1.57
L
NOTE:
DETAIL-A
α
C
10
MIN
0.90
0.00
0.90
0.25
0.09
2.80
2.60
1.50
0.35
1. All dimensions are in millimeters.
2. Lead coplanarity should be 0 to 0.10mm (.004") max.
3. Package surface finishing:
(2.1) Top: matte (charmilles #18~30).
(2.2) All sides: matte (charmilles #18~30).
(2.3) Bottom: smooth or matte (charmilles #18~30).
4. All dimensions excluding mold flashes and end flash
from the package body shall not exceed o.152mm (.006)
per side(d).
REV. 1A February 2001
KM4100/KM4101
DATA SHEET
Ordering Information
Model
KM4100
KM4101
Part Number
Package
Container
Pack Qty
KM4100IC8
SOIC-8
Rail
95
KM4100IC8TR3
SOIC-8
Reel
2500
KM4100IT5
SOT23-5 Partial Reel
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